02 Feb

Protect Your Email Address with PHP Hide_Email()

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PHP hide_email() is a PHP function to protect the E-mail address you publish on your website against bots or spiders that index or harvest E-mail addresses for sending you spam. It uses a substitution cipher with a different key for every page load.

PHP hide_email() encrypts your E-mail address and generates the javascript that decrypts it. Most bots and spiders can’t execute javascript and that is what makes this work. A visitor of your web page will not notice that you used this script as long as he/she has javascript enabled. The visitor will see “[javascript protected email address]” in stead of the E-mail address if he/she has javascript disabled.

You can also use the generator if you have no PHP support on your web server. Change the E-mail address into your own E-mail address and press “Generate”. Cut and paste the generated XHTML into your own web page.

Requirements: -
Demo: http://www.maurits.vdschee.nl/php_hide_email/
License: License Free

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Comments

http://www.subscript.ca Scott MacDonald

Cool idea… though I really doubt it will take long at all for there to be bots that will start parsing this. The safety lies in the fact that hopefully it doesn’t get too popular, or finding your own ways to slightly tweak it.
Fan

kinda cool… but you could just use gmail and not worry about spam.
http://www.steinhaug.no/ Kim Steinhaug

This is probably a great idea to implement on our customers webpages, as an option for them to enable. Myself I still have doubts about anything that isnt compatible with a none js browser – however I must be thinking like a dinosaur now.

I used that argument like 5 years ago, it cannot possibly still be valid! Most parsers can’t possible see this, even if theoretical possible as they wouldt need to render the page which gives enourmous overhead when scarping say a million webpages. I am pretty sure you eliminate 99% of scrapers this way.
http://www.open-source-editor.com Mattias Wirf

Great, the more ways to fight spam the better. I also think about the none js browsing visitors, but that can’t be a high number, right?
qqrq

Kim => IMHO worrying about users that don’t have JS enabled is NOT just old-fashioned. Remember about tools that disable JS, which user can install (i.e. as Firefox add-on). It’s not a bad idea to use this stuff – if you launch browser from admin account (everything else in WinXP is pain in the ass), you can still suffer from “evil” scripts. And what about work? Some of us have blocked scripts doing their jobs.
http://fedmich.com/life fedmich

I prefer the js version, but if possible, I’ll just make an image to show the email.

anyway, here’s one I made before and use,
http://www.pastetool.com/hide_email/

Thanks for sharing
http://wesam.ly Wesam Alalem

great function, I was using something like ‘mail AT example DOT com’, but now I’ll use this.
Thank you
http://www.steinhaug.no/ Kim Steinhaug

Alright, I just got the perfect sollution to make everyone happy here. The noscript function should simply be something like:

A simple switching of letters and other way around serverside, and voila a perfect sollution! To bad I dont have my own blog up, I could have made myself some bonus hits by adding this feature!
http://www.steinhaug.no/ Kim Steinhaug

Nice, the code was removed, logic was

noscript
img src=”imagecreation.php?codedemail@here.com

The email fed to the image cration script would then have some letter switching, simple as a=c, c=b,c=a and such would be enough – than other way around server side.
http://fedmich.com/life fedmich

GD Creation of image adds CPU load on the server, which I don’t want to resort to as much as possible.
http://www.ahwd.co Aisha Henderson

I love this. Awesome!
chris

Kim,
I’d love to see more of your script. I follow that you’re using php to generate an img (which i’ve never even thought to do). I get you have some script that switches letters, too, but if you’re generating an image with the email address, why do you need to switch the letters?
Thanks!

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